Square Avatar With Border

import 'package:extended_image/extended_image.dart';
import 'package:flutter/material.dart';

DecoratedBox(
  decoration: BoxDecoration(
    borderRadius: BorderRadius.circular(10),
    border: Border.all(
      color: Theme.of(context).primaryColor,
      width: 3,
    ),
  ),
  position: DecorationPosition.foreground,
  child: ClipRRect(
    borderRadius: BorderRadius.circular(10),
    child: ExtendedImage.network(
      'https://images.pexels.com/photos/846741/pexels-photo-846741.jpeg?auto=compress&cs=tinysrgb&w=600',
      fit: BoxFit.cover,
      width: 48,
      height: 48,
    ),
  ),
),